关键词: 图像分割, 光源序列, 表面缺陷, 图像对比度

Abstract: The model and installing angle of illumination will affect the captured image quality and then lead to different texture characteristics with the same image.At present，the normal acquisition system regards the influence of illumination as negative factors.But actually this difference between varying illuminations can be used to segment defect images and obtain more complete and correct image information.Because the segmentation algorithm based on illuminant series include more defect features than single illumination.Firstly the image series are obtained in different directed illumination.Then the feature is derived，which corresponds to a tilt angle with maximum image intensity.Finally the segmented result using linear decision criteria is acquired in the feature space.Experimental result shows that this method enables to obtain higher contrast images and segments defects from background accurately.

Key words: image segmentation, illuminant series, surface defects, image contrast